added ROADMAP file and suggested location in sidebar

Signed-off-by: Ofer Mendelevitch <ofermend@gmail.com>

Author: ofermend

src/documentation/roadmap.malloynb

@@ -0,0 +1,79 @@
+>>>markdown
+# Malloy Public Roadmap
+
+It is a common request for "what to expect next". This roadmap file is our best effort to share with the community our thoughts about Malloy roadmap.
+* This is directional, not a commitment schedule.
+* Items shift as PRs land and priorities change.
+
+**2026 goal:** Make Malloy + Publisher as capable as commercially available semantic modeling & BI tools - from warehouse connection to dashboard - fully open source.
+
+Have a request or idea? [Open an issue](https://github.com/malloydata/malloy/issues/new/choose) · [Start a Discussion](https://github.com/malloydata/malloy/discussions) · [Join Slack](https://malloydata.github.io/slack)
+
+---
+
+## In Progress 🚧
+
+### Language
+
+- **The `in` operator** - membership testing: `carrier in ['UA', 'AA']` *(accepted)*
+- **Persistent sources** - `#@ persist` to cache expensive intermediate results as tables *(experimental: `persistence`)*
+- **Type declarations & virtual sources** - abstract source schemas bindable at runtime *(experimental: `virtual_source`)*
+- **Givens (model-level parameters)** - runtime-bound `$NAME` values for row-level access control, per-tenant filtering, and other request-scoped context *(experimental: `givens`)*
+
+### Ecosystem
+
+- **Publisher UI refresh** - new layout and navigation, with better visualization defaults
+- **Materialization via CLI** - `#@ persist` annotation + `malloy build` to persist tables with dependency ordering
+- **Query result cache & pagination** - handle large result sets without timeouts
+- **Python DataFrame client** - Publisher REST client returning pandas/Polars DataFrames
+- **MCP toolset** - revised core tools for model discovery, query execution, and result retrieval
+- **Core chart enhancements** - reference lines, combo charts, dual Y-axes, `snake_case`→Title Case
+- **Table enhancements** - pinned header, conditional formatting (heatmap coloring), interactive sort
+
+---
+
+## Planned 📋
+
+### Language
+
+Full proposal details in [malloydata/whatsnext](https://github.com/malloydata/whatsnext).
+
+| Feature | What it enables |
+|---|---|
+| [Source & query parameters](https://github.com/malloydata/whatsnext/blob/main/wns/WN-0002-parameters/wn-0002.md) | Parameterized `time_filter`, `string_filter`, `numeric_filter` on sources and views |
+| [Drill](https://github.com/malloydata/whatsnext/blob/main/wns/WN-0021-drill/wn-0021.md) | Structured drill-down from summary views to detail rows |
+| [Modules](https://github.com/malloydata/whatsnext/blob/main/wns/WN-0010-module-support/wn-0010.md) | URL-based module imports for shared Malloy libraries |
+
+### Database Support
+
+Current: BigQuery · Snowflake · DuckDB · MotherDuck · PostgreSQL · MySQL · Trino · Presto · Databricks
+
+Other databases under consideration:
+
+| Connector | Notes |
+|---|---|
+| Redshift | Amazon Redshift / Serverless / Spectrum |
+| Oracle | Oracle Database / Autonomous DB |
+| Native T-SQL (SQL Server / Azure SQL) | High priority; MS Fabric requires Entra ID auth |
+
+### Publisher & Ecosystem
+
+| Area | Feature |
+|---|---|
+| **Explorer** | Dimensional index values in filter UI; field documentation display; cross-filtering between charts |
+| **Publisher** | Standalone Python MCP server; `malloy-pub` CLI; Windows/Linux support |
+| **Renderer** | Dark/light mode; CSS variables for embedding; chart legend consistency; `# area_chart`, `# pie_chart`, `# heatmap` |
+| **Python** | Ibis-style API: `ibis.malloy.connect(...)` with `s.dimensions()`, `s.measures()` selectors |
+| **Docs** | LLM-optimized documentation page; expanded `malloy-samples` |
+
+---
+
+## How to Influence This Roadmap
+
+| Channel | Best for |
+|---|---|
+| [malloydata/whatsnext](https://github.com/malloydata/whatsnext) | Formal language change proposals (WNs) |
+| [GitHub Discussions](https://github.com/malloydata/malloy/discussions) | RFCs, design conversations, questions |
+| [GitHub Issues](https://github.com/malloydata/malloy/issues) | Bug reports, concrete feature requests - 👍 votes signal demand |
+| [Slack `#feedback`](https://malloydata.github.io/slack) | Informal ideas and early feedback |
+| [Pull requests](https://github.com/malloydata/malloy/blob/main/CONTRIBUTING.md) | New database connectors especially welcome |

src/table_of_contents.json

@@ -437,6 +437,15 @@
           "link": "/experiments/givens.malloynb"
         }
       ]
+    },
+    {
+      "title": "Roadmap",
+      "items": [
+        {
+          "title": "Roadmap",
+          "link": "/roadmap.malloynb"
+        }
+      ]
     }
   ]
 }